Whilst it is concluded that the AF reliability and accuracy of the K-5 / SAFOX IX+ could drop drastically for low light EVs, at or below EV8 (i.e., 1/60s at f/2.8 at ISO200, say for example), I found that the major limitation of his test is that the results are actually affected much by the optical defects of a lens. That says the test would yield more accurate and ideal results for a perfectly aligned lens (i.e., no de-centering of any) with perfect optical performance/design and deficiency (no CA and with very high central resolution, etc.).

What I want to say is that Falk's method not only measure the AF errors, but also more so on the optical defects of a lens, which could be more noticeable and take more effects when the lens is wide opened.

Also, I think that mixing the results of various different lenses with which test shots were made under various conditions and present them in a single chart may not be a good enough idea. Yes, I think it is an "overall picture" that has certain reference value. But then presenting the test result lens by lens and one by one will surely reveal even more things and has even better reference value, I believe. Furthermore, to do a truly scientific and systematic test, the variable factor should be even limited to one at a time. I knew this would be extremely time-consuming and huge efforts are required, nonetheless.

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Since 1988, I have been using a Pentax SLR for shooting. My own profession is an electronics engineer. I am actually a photographic gearaholic and a true Pentax supporter owning ALL Pentax camera systems namely Pentax K and 645 (both Film and Digital) and Q, counting Five in Total. Over years, I have huge investment in Pentax and I do love most of my Pentax glass. After all, Pentax is yet the brand I love and concern most and that's why this Blog!